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We, like so many others, have joked about Twitter's non-existent business model and its frothy billion-dollar valuation.Apparently we might have to stop that - at least for now.The San Francisco-based micromessaging company is said to be profitable, according to a report in Bloomberg that quotes someone close to the company.

Earthwatch Institute is an international non-profit organization that brings science to life for people concerned about the Earth's future. Founded in 1971, Earthwatch supports scientific field research by offering volunteers the opportunity to join research teams around the world.